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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1854

post #18531 of 38701
Quote:
Originally Posted by rck1984 View Post

Default core voltage is 1.093mV / Default memory voltage is 1.600mV.
Keep in mind i am running a crossfire setup though, so overclocking isn't as easy as it is with a single card. Card A might be a better overclocker than card B or visa versa.
Strange thing is that i can push both my cards to 1150mhz on the core without too much effort, but getting it above 1425mhz on the memory is another story. Then again, 1425mhz doesn't seem to be that high to me... Could adding memory voltage help, to get my memory overclock above 1425mhz?
Also, do i really need more then 1425mhz on the memory (2560x1440) or is it just the coreclock that really matters?

Well, if you ask me... If I had 2 cards, I wouldn't overclock anything. Especially the memory while I've never seen solid worthy results to keep doing so. I would be betting completely on stability. However, my 24/7 oc is 1000Mhz core and 1400Mhz memory without touching voltages. But mostly I play on default clocks. Now with latest beta drivers, I can play BF3 on High settings with 4x MSAA ( only textures on Ultra and blur off ) and FPS cap at 65. I don't have many, serious slowdowns ( <50fps ) anymore and I really love it.
Edited by Deo Domuique - 12/7/12 at 2:14am
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post #18532 of 38701
yup exactly that, ive got 2 Lightnings and every mhz on the gpu scales way better after I hit at least 5ghz on the cpu
post #18533 of 38701
Found a winning combo for my Sapphire vapor-x 7950 I think.

Thanks to the links for the modded Trixx I can now use the latest 7950 drivers that sapphire released on Facebook and then up the MVDDC biggrin.gif

No crazy high VRM 1 temps, core seems to run a bit cooler, and as a result fans not so noisy. Only had time to do a couple of Heaven runs and play a round of battlefield but all seemed to be running fine. 1100/1500 with VDCC 1118 and MVDDC at 1600. Think I could run the core higher with a bit more voltage but increased noise
post #18534 of 38701
Quote:
Originally Posted by Deo Domuique View Post

Well, if you ask me... If I had 2 cards, I wouldn't overclock anything. Especially the memory while I've never seen solid worthy results to keep doing so. I would be betting completely on stability. However, my 24/7 oc is 1000Mhz core and 1400Mhz memory without touching voltages. But mostly I play on default clocks. Now with latest beta drivers, I can play BF3 on High settings with 4x MSAA ( only textures on Ultra and blur off ) and FPS cap at 65. I don't have many, serious slowdowns ( <50fps ) anymore and I really love it.

I understand. On 1920x1080 and everything maxed out, i was running perfectly fine in the majority of games such as BF3. However, since i am playing on 2650x1440 for a little while now, i notice i could use the extra performance gained from overclocking. Also, when it comes to graphics settings, i am kind of a freak and want things to be maxed out (with an exception of MSAA, which isn't that necessary on such high res).

But then again, if its minor gains for such effort.. I rather let the memory be on 1425mhz and see if i can push my clocks towards 1200.

Quote:
Originally Posted by Anomander Rake View Post

yup exactly that, ive got 2 Lightnings and every mhz on the gpu scales way better after I hit at least 5ghz on the cpu

Perhaps i should try to push my i5 2500k a little more, i'm on 1.400v already though..
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post #18535 of 38701
Quote:
Originally Posted by Anomander Rake View Post

Sonda you got a lovely card over there:) whats your highest oc on the card and what temps where you getting on gpu/vrm/mem?
I got p....d off and reinstalled windows 7.... problem went away, actually got the second card to finish 3d11 at 1190mhz on the gpu....


Thanks. I will do some Furmark benchmarks when I get a chance at around 1325/1900. That is the highest I think I have done a Furmark run.... Later on.
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post #18536 of 38701
I've noticed not many people own a Vapor X 7970 here, but is the maximum overclock on stock 1195? I plan to oc mine as far as i can on stock..
post #18537 of 38701
So a single 7950 with a modest OC is insufficient to run new games on high settings at 2560x1440?
post #18538 of 38701
Quote:
Originally Posted by meddle3 View Post

So a single 7950 with a modest OC is insufficient to run new games on high settings at 2560x1440?

Totally depends on what kind of games, and if you want to turn all the eye-candy on or not.
I am running 2x 7950 @ 1125/1425 on 2560x1440, a couple rough examples (not 100% accurate):

- Battlefield 3 Single Player, Ultra / 2x MSAA: Min: 65 | Max: 125 | Avg: ~85 fps.
- Battlefield 3 Multiplayer (depending on map/amount of players), Ultra / 2x MSAA: Min: 55 | Max: 115 | Avg: ~75 fps.
- Hitman Absolution, Ultra / 2x MSAA: Min: 45 | Max: 90 | Avg: ~65 fps.
- Far Cry 3, Ultra / 2x MSAA / HDAO: Min: 40 | Max: 100 | Avg: ~ 60 fps.

As you can see, in some of the newer/heavier games, the fps can drop into the 40's.
Ofcourse this is on highest settings, you could get away with lowering settings obviously.

In short: You definitely need some serious horsepower if you want to run this kind of games on 2560x1440 and highest settings.
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post #18539 of 38701
Quote:
Originally Posted by meddle3 View Post

So a single 7950 with a modest OC is insufficient to run new games on high settings at 2560x1440?

A single HD 7950 overclocked to 1.1 Ghz should do well. You just need to run at lower MSAA or without MSAA at 1440p depending on the game and your fps target.
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post #18540 of 38701
Had one 7950@1100mhz on a 2560x1440.

Just turn off the MSAA (You don't need it at that res) and you will be fine.
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